Step-by-step explanation:
look to the picture of my answer.
X= -4y let this be equation 1
x+5y=2 let this be equation 2
substitute equation 1 in 2
-4y + 5y = 2
y=2
substitute the value of y in equation 1
x= -4y
x= -4(2)
x= -8
First isolate the power of 10 on the right side by dividing both sides by 5:

Now you're free to take the logarithm and simplify where you can:

Then solve for
:
